Brush-less Chainsaw

Abstract

A brush-less chainsaw is disclosed, comprising a housing, a brush-less motor, a transmission device, a power supply, an electronic commutator, a brake backplate, a chain plate, and a chain. The brush-less motor, the transmission device, and the electronic commutator are disposed in the housing. The brush-less motor is connected with the electronic commutator. A power output end of the brush-less motor is connected with the transmission device. The electronic commutator detects a position signal of the brush-less motor and controls the brush-less motor to drive the chain and the chain plate to rotate. The electronic commutator receives a brake signal from the brake backplate and transmits the signal to the brush-less motor. The brush-less motor drives the chain to brake according to the brake signal. The brush-less chainsaw has the advantage of optimizing the performance, along with small size, low cost, large torque, and small braking current.

What is claimed is:  
     
         1 . A brush-less chainsaw, comprising a housing, a brush-less motor, a transmission device, a power supply, an electronic commutator, a brake backplate, a chain plate, and a chain; the brush-less motor, the transmission device, and the electronic commutator being disposed in the housing; characterized in that, the brush-less motor is connected with the electronic commutator; and a power output end of the brush-less motor is connected with the transmission device. 
     
     
         2 . The brush-less chainsaw according to  claim 1 , characterized in that, the transmission device comprises a transmission body, an output shaft assembly, a gearbox cover, and a chain wheel; the transmission body is fixedly connected to the power output end of the brush-less motor; the output shaft assembly is fixedly disposed in a hole in the transmission body; the gearbox cover is installed on the transmission body; the output end of the brush-less motor is connected with the output shaft assembly through a gear; and the output shaft assembly drives the chain wheel so as to drive the chain to rotate. 
     
     
         3 . The brush-less chainsaw according to  claim 2 , characterized in that, the tooth profile of the gear is an involute profile or circular arc. 
     
     
         4 . The brush-less chainsaw according to  claim 2 , characterized in that, the transmission device is a single-speed change structure, a multi-speed change structure, or a step-less speed change structure. 
     
     
         5 . The brush-less chainsaw according to  claim 2 , characterized in that, the gear comprises a driving wheel and a driven wheel; when the size of the driving wheel is smaller than that of the driven wheel, the transmission device conducts the deceleration function; when the size of the driving wheel is larger than that of the driven wheel, the transmission device conducts the acceleration function. 
     
     
         6 . The brush-less chainsaw according to  claim 1 , characterized in that, the housing is internally provided with an oil pump and an oil kettle; one end of the oil pump is connected to the transmission device, and the other end is connected with the oil kettle. 
     
     
         7 . The brush-less chainsaw according to  claim 1 , characterized in that, the housing is connected with an alarm display device; the alarm display device is connected with the brush-less motor, the transmission device, and the electronic commutator. 
     
     
         8 . The brush-less chainsaw according to  claim 7 , characterized in that, the housing is connected with a switch trigger, a main switch, a first microswitch, a second microswitch, a brake backplate and a lighting switch; the switch trigger is linked with the main switch; the first microswitch and the second microswitch are linked with the brake backplate; the main switch, the first microswitch, the second microswitch, and the lighting switch are all connected to the electronic commutator. 
     
     
         9 . The brush-less chainsaw according to  claim 1 , characterized in that, the electronic commutator is also connected with the input end of the power supply, and the power supply mode of the electronic commutator is DC input or AC input. 
     
     
         10 . The brush-less chainsaw according to  claim 9 , characterized in that, the power supply is a DC power supply; the input end of the power supply is connected with a detachable DC power supplier, a detachable portable battery pack or AC/DC transformer; the power supply is an AC power supply, and the input end of the power supply is connected to the mains supply. 
     
     
         11 . The brush-less chainsaw according to  claim 1 , characterized in that, the housing is also provided with a main air inlet and an air outlet; the housing is internally provided with an air baffle; the dissipating plane of the electronic commutator is disposed behind the main air inlet or in front of the air outlet such that the air flow generated by rotation of the brush-less motor passes through the dissipating plane of the electronic commutator to bring the heat away.